360 Heads- which ones should I expect?

Thanks GTX.

Is there a significant difference in performance capabilities with the 76-earlier and the 77-86? Would it be worth my time to invest in a set of earlier/later heads? Or possibly Magnum heads?

I looked at the 360 Builds in the tech section and Option 3 (with the 79 heads) and it seemed like the ticket for a good street motor.